1-13Configuring IPv6 TCP PropertiesThe IPv6 TCP properties you can configure include:z synwait timer: When a SYN packet is sent, the synwait timer is triggered. If no response packet isreceived before the synwait timer expires, the IPv6 TCP connection establishment fails.z finwait timer: When the IPv6 TCP connection status is FIN_WAIT_2, the finwait timer is triggered. Ifno packet is received before the finwait timer expires, the IPv6 TCP connection is terminated. If FINpackets are received, the IPv6 TCP connection status becomes TIME_WAIT. If other packets arereceived, the finwait timer is reset from the last packet and the connection is terminated after thefinwait timer expires.z Size of IPv6 TCP receiving/sending buffer.Follow these steps to configure IPv6 TCP properties:To do… Use the command… RemarksEnter system view system-view —Set the finwait timer of IPv6 TCPpacketstcp ipv6 timer fin-timeoutwait-timeOptional675 seconds by default.Set the synwait timer of IPv6 TCPpacketstcp ipv6 timer syn-timeoutwait-timeOptional75 seconds by default.Configure the size of IPv6 TCPreceiving/sending buffer tcp ipv6 window size Optional8 KB by default.Configuring the Maximum Number of IPv6 ICMP Error Packets Sent within a Specified TimeIf too many IPv6 ICMP error packets are sent within a short time in a network, network congestion mayoccur. To avoid network congestion, you can control the maximum number of IPv6 ICMP error packetssent within a specified time. Currently, the token bucket algorithm is adopted.You can set the capacity of a token bucket, namely, the number of tokens in the bucket. In addition, youcan set the update period of the token bucket, namely, the interval for updating the number of tokens inthe token bucket to the configured capacity. One token allows one IPv6 ICMP error packet to be sent.Each time an IPv6 ICMP error packet is sent, the number of tokens in a token bucket decreases by 1. Ifthe number of the IPv6 ICMP error packets that are continuously sent out reaches the capacity of thetoken bucket, the subsequent IPv6 ICMP error packets cannot be sent out until new tokens are put intothe token bucket based on the specified update frequency.Follow these steps to configure the maximum number of IPv6 ICMP error packets sent within aspecified time:To do… Use the command… RemarksEnter system view system-view —
